Hello Andy,
my first guess is either the gate drive or the n-channel igbt parameterization was less than clear in the documentation and a paramter or two need to be modified to provide the results that you expect. Is this is a simple model where you could share the simscape model? If so, I could debug it to see what can be done our side to make setting up the initial simulation to work correctly. Also, if you don't want to post the model here, would you be willing to email it if I provided my email?
Regards,
Joel
